Best available cop



Jan. 10, 1928.

Filed Sept. 6. 1924 gnwnfoz .tive andtae'curate operati0n-,;.-l .7

Patented Jan. 10, 1928.

"WT-BI T ES T ADnEU's 'srEPHENs cAsnER, or 'PL,euNFt"Eli-15,; rnwtjsiis'iairfrlssrelton' TQ- itamo ELECTRIC CLOCK CORPORATION, OF NEW"'YORK,"NYY; A! CORPORATION- 0f DEL'AF "-I 5.5 lL- ilz z li'i t-pflei "WARE.

'I ApplicafinmfiledSeptember .The presentyin'vention relates to c -locks and Y-more particularly tosecondary electric clocks. lt- :is' an, obj ect of this invention to prqyide a novel and improved =form of electrie g see oncla ryvclock. ,1

1 5: More -p'articularly, it is nan invention to provide aflseeon dary cloek in whlch all gearing, OXCCPt-tl1GgLLS11tl reducing natedtherebyvwgreatlyf redi cjng .in rn nrber the requisiteinoxzing parts; ;so that th e .QlQCk is easy;;to,..construet; and assemble, may be quickly repaired, and may bemade small in size while ,at the ,sanieat-irneaflording posi- .;.-A still ,furtheraobjegt of this 55565; is

to provide in'-a =secondaryelectricclock; positive actuat ng me ns. Qpe at-ivethm ghq fi a full circle and .aifi .nirm etioti i ln l quivralentmi the-number .otirnpul esrece' a t-by -.the- Cl0 k. intanh mz;

11, the-acc mpanying g ill In said drawingsg 1 w", Figure 1 is a'front elevationof the clock, the casing andidial being omitted for, thc sake of clearness. U

V Figure 2 is a vertical section on line 2-2 of Figure 1. Figure-.3 is a front View of a fport ion of set. forth ;in the appended glairns i g H the mechanism on a much larger scale.

Y The frame of the clock comprises essen- ,tially the back plate vl0, having the circumsferential flange llstruck up the.refrom,the front plate 12 having the circumferential flange 13 adapted to fit snugly over the flangell and the bearing :strip 14; extending dianie trically across, parallel to, and -spaeed above,'the front plate 12 and v fa stened t-h er eto by the screws.-,l 5 ;,The .front andsback. plate flanges are secnredg-together hy gany -;suitable\means, such as the rivets L6, V

Rotatablysupported in--,th e.bearing strip =14 is; the hour sleeve 17,1.and. extending throughthis hoursleeVe andfhaving itsrear end :journallecl .in the 'b'earing IS pressed. ,into an aperture in the center; ofthe part SECONDARY ELE CiRI C seat e-sh. by: qneis d all-zl 25: 43

l of fth f rem; 1 the thenorrnal fiflat-rest-.position thereof, ,and it r1 be; note z ha h e 8% 91b LOCIL- .x. I l: il um; .51 1:1,:(5 s, 1924. Serial No. 736,372. .1! S. m is ai r. .4 't espl t l0 se-th m n aft,- 1 .,-t e.immutei hattwan ou isle be ng connected by-thetusu al twelye;-to;- one educlns-g ring f lhe .h h-mnim n h nds r fi ppert i resii t'w y r 5 itlle'i ateniielid of e/1m s e ei and shaf 4; :ebpac d; item; andsurromdt g the inner ie m 'ip them pu e-shaft lads-th o ti r -m e. i@ wre- 2 v1 av ng thmrede ,rear end-20 p esse intmamapertiire nt rear -p ateilQ-anflieetrying. at t neuter; th bushmgQlB, pm'me sly meatiqnede Th p Q 2 .isptes egli-tigh ly verfibe-mreZO and Qa t ies-ea 11 d; ne-cp t d li nQ fQ w amete;a oskueniladapte ,tea ien s renewalx; prefera ly a minute n r Mounted mime. sha taw and eldei 1 L l EQL h tw e xi m,piniemZZ-fini the collar ,23 fisrtb zt i'eks wpsd armatur y ngin t e .ezplene-a i :tlxeimnt plate a rvhbsc ql eweyea S QW fliJTh a t skl si i rmedwe i eit l zon and .-is. .-m:. y. d

,- similar [Qt l f he; a

,a'nd 23, end if desired there .may. he grooves 29 reheyxpg the teeth; The;diamete rs of the opening-in the frqnt plate l2 andof the ar net nre dlskfl are snclrthat the tips of the teeth;. on the .two par.ts have just sutlicient clearance to allow the armaturedisk to rotate freely g 1 Considering Figuretl, the dotted: position armature disk represents pa l ii e Led 26 1 t.c9 'g W -s1 i Qther Li i oll tet-cl kwise d rectwn :When i-t-h winding ,on the. mag-- netic core 20 .is energizeda -;r na,gneti e eir- Qlllt. {1s fiorrned through the back plate 10,

= ,fron t iplatetl2 shaft l9, core 20, armature -di .l fi,.en i th a r p b n t e correspondlngpa rs ot teeth on. the parts'12 and 24, ogf these variously mentioned parts -eque sigeza s il being formed of suitable magnetic material. As is well known, the lines of force from a magnet always tend to assume-the shortest possible length, and for this reason, the disk Qavill be rotated in the direction of the arasjivbi Figure 3 in order to shortenthe gap between the teeth, the minimum length of this gap being attained when the disk reaches the full line position, as shown in this figure.

A disk or roller 30 of insulating material, such as hard rubber or fiber, is mounted n' ')'o'ii"a rear spring 31 carried by the bracket 32, fastene'chupo'ifi the front plate 12 and tits in an opening-33 therein. -Tli' spring nor mally presses the roller downwardly into the recesses between two adjacent teeth on the armature, as shown in the dotted lines in Figure '3; t' of'hold th'e'arfiiature in its normal at-rest position against rotation'. \Vhen 'nieeleaiqiaagn'et i's"ne"rgized, as it will be at min'ufe intervals; wl'ij'ere they are sixty teeth 'oii araiaaire 24,-tli'e armaturewill be indeededit nie-d'ottediiiie position to the famine iibs' i'cien-sFigare 3, so that the tips fofthe tie'thfl on' the two parts. are nearest "to 'e'aeiii'euter; siate' the armaturemoves; into a position-which e ame s the flux to pass across the smallest possiblai'f' 1 By this 'nioveinn't, che- 'i eller; 30 is raised a ainst the antea er thei'springffl from it's -dotted-libsposifiisa tofalrliiie positien, Figai -ga el 'vtiQhna pO iti'ea it is resting o -ae pdinco' o'ii'of the teeth' of the arma- "t'iire ea -(h'eit ti'ifma'g'net dc-energized, "the sprii'1gf31' acts toaim; the roller" 30 n wi'iwa'rdiyand to continue-the-"forward movement (if the arinatii'r -rin'til the feliciagain contacts with two adjacent tee tlfa'nd -'c an iii-ave dowiiwaraty hombre, this action resi'fltingfrom tlfdtztdt thtttthta t'ip 'of the asoma'ias i iaeadyaioveazi eyeaa a radi alfljrie connecting are shaft s; wai the-pivot of the toner 30 The art-astute win new occupy *cneposnaasnwa in dotted lines in Figure a,Having-moved-ehe-settietli'of 'a-revoiatit'n, and "the elcti oinfa gr'i'et' i i-21y be energizd at tl'ie' tefniination of aiibther 'ii'i i nute teadv'anc'e th"arhi"atiiir iir'idth'er tooth and tlielbyiidt iiiic't'li lliihdS i i I Itis apparent that the number of 'moving want-nit cI6ck-ha\ie"beenreduced to a ii'iin'i iii ih a'a ting-eating; eliminated, except 4 jetwe'e n' the hand slia ft which-cannot b'e di' spens edwith where twoliandst' are employee; The individual pa i tsof the iii'tihzinis'ni fare-of great simplicityfet'i's y fabricated, and are very durable, no spring-s; with" the "ekeeption of -the single "leaf -s'r'ffiii'ig'ff31, bein emplbyed, and weights a'ie"* iiiitirely "elf-mi atd." The absence of ."geai'iiig and spii'iigsfreiidrs' the usual spring cliit ch platted betweenfthe minute shaft and aie ciack gearing anaces'sar and in order to set the clock it is only necessary to rotate the minute hand to the desired position, the armature Z4 rotatii'ig idly and the roller 30 riding freely over the teeth.

By applying the rotating force throughout the periphery of the armature, a more illtli'lbcl in the same plane as said disc and having corresponding inwardly disposed projections, anelcctroiiiagnet in circuit oe- "t'wc'en said annular member and disc, means to periodica'ily excite said magnet to cause magnetic-flux to flow across the gap between said sets of projections and mov'e said .armature a portion of the distance between two projections on either member and spring means to complete the movement over said -distance.

2. In a secondary electric clock, in combination, a wheel having spaced peripheral projections constituting an armature, an annularmember I having similarly v spaced; in- 'W'aidly disposed,- projections constituting a pole piece, an elBCClQHU ignt, adapted to receive periodic impulses, interposed-in circuit between said pole piece and armature remote from the gap between said projections, each energi'zation of said magnet causi'ng"said projections to attract each other and rotate said armature a portion' of the distance between adjacent projections, and means to complete the rotatioi'i'over sa'iddi'stanc'e and to position said armature for magnetic move; ment by the next impulse.

- 3. In a secondaryelcctricjclock, itiCOllibination, a back pla't'e, an annular front plate connected thereto, an arn'nit-n'r'efdisc rotativ'ely supported in the plane o-t' said fro'iitp'late, a shaft supporting said arniature,'a'n electroinagnet. surrounding said shatt-andada'pted to receive periodic impulses, "opposed teeth on said disc and front plate having a gap between 'said teeth being er such configuration that-the magnetic flux; crossing said gap to tates said disc a portion ofthe peripheral pitch of a to'oth'at each impuls'e',-and a detent ffor completing-the rotation to full pitch distance and for positioniii'gs'ai'd t-etiion the armature in operative relation to'said ot-her annnlarpole piece having a phiralityofin- I 1 wardly disposed projections,"a shaft for said armature and an electromagnet sin-rounding said shaft to magnet- 124c said armature and pole piece to cause partial rotation ot said armature, and means to cause additional 170- tation to position the projections one space forward.

5. A secondary electric clock including in S" combination a flat back olate an annular front plate parallel thereto, an armature disc rotatably mounted in the plane of said front plate, an axle for said disc journalled in said back plate, and an electromagnet having a core concentric with said axle.

6. A secondary electric clock including in combination, a back plate, an annular front plate parallel thereto but spaced therefrom, an armature disc rotatably mounted in the plane of said front plate, an axle for said flange, a. diametrically disposed bearing plate carried by said front plate, an axle for said disc journalled between said back plate and bearing plate, an electromagnet surrounding said axle and adapted to be energized periodically and means on said disc and front III,

plate cooperating to rotate the disc upon energization of said magnet.

8. In a secondary electric clock in combination, adisc having a plurality of peripheral projections constituting an armature, an I annular pole piece having a plurality of inwardly disposed projections, a shaft for said armature, and an electromagnet having a core surrounding said shaft to magnetize said armature of one polarity, said pole piece being connected, with said magnet core whereby it is magnetized of the opposite polarity to cause a partial rotation of said armature, and means to cause additional rotation to position the projections one space forward.

In testimony whereof I hereunto aflix my s1 gnature.

THADDEUS STEPHENS CASNER. 

